The shadow zone is the area of the earth from angular distances of 104 to 140 degrees from a given earthquake that does not receive any direct P waves. The shadow zone results from S waves being stopped entirely by the liquid core and P waves being bent (refracted) by the liquid core.
There are two types of Shadow zones:
one for P waves and
one for S waves.
P wave shadows between 104-140 degree, both sides; S wave shadow from 105 of one side to 105 of the other.